Key-changing attachment for cornets.



, PATENTED MAR. 19, 1907. 4 M. B. KENDI'S. KEY GHANGING ATTACHMENT FORCORNETS.

APPLIUATION 'FILED DEO.15,1906.

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MICHAEL B. KENDIS, OF OMAHA, NEBRASKA.

KEY-CHANGING ATTACHMENT FOR CORNETS..

Specification of Letters Patent.

Patented Maren 19, 1907.

Application ned December 15,1906. semi No. 348,070.

To (1J/Z 71171/0777, t tay/ con/cern.:

Be it known that l, MICHAEL B. KENDis, a citizen of the United States,and a resident of Omaha, in the county of Douglas and State of Nebraskahave invented certain new and useful Improvements in Key ChangingAttachments for Cornets, of which thel following is a speciiication.

My invention relates to musical instruments, more particularly tocornets or instruments of similar type; and it is-the object thereof toprovide a device, attachable to any cornet, by which the key thereof maybe quickly changed by the musician without interruption of playing oreven without removing the fingers from the valve-stops of theinstrument.

A further object of my invention is to provide in a device of the classdescribed means for automatically taking up wear of the engagingsurfaces and maintaining at all times a perfect joint between the same.

A device embodying my invention. is shown in the accompanying drawings,in which- Figure 1 is a longitudinal section of the device, the sectionbeing on the line x of Fig. 3. Fig. 2 is a transverse section on theline y y of Figs. 1 and. 3. Fig. 3 is a plan view of the device, andFig. 4 is a detail section of one of the spring take-up devices formaintaining uniform contact between and compensating wear of theengaging faces of the parallel plates to which the air-tubes areconnected.

ln the construction shown l provide the parallel plane-surfaced plates 1and 2, on which are carried the tubes 3 and 4L, the tube 3 being adaptedfor connection with an ordinary mouthpiece A and the tube 4l beingadapted for connection with the main tube B of the instrument on whichthe device is used. On the plate 2 are the studs 5, which extendtherefrom toward and pass through the plate 1. In the ends of said studsare placed screws 6, having enlarged shouldered heads, as shown in Fig.e. Short tubular sections 7 are placed over the shoulders of thescrewheads, and said tubular sections 7 inclose small coil-springs S,which bear against the plate 1, pressing the same toward the plate 2.

Pivotally held between the plates 1 and 2 by the pivot-screws 9 and 10is a body comprising the parallel plane-surfaced plates 11 and 12,connected by the straight tube 13 and the bent'tube, consisting of theelbowed portions 14 and the U-shaped tuning-slide 15, of which the legsare slidablewithin the elbowed portions 14, as shown in Fig. 1. On theplate 12 is a small upwardly-extending knob 16 in a position easilyreached bythe thumb of the right han d of the player without removingthe fingers of the hand from the valve-stops of the instrument. By meansof said knob 16 the pivoted body maybe tilted either to bring the shorttube 13into alineement with the tubes 3 and 4, as shown by the dottedlines in Fig. 2, or to bring the longer U-shaped tube into alinementwith the tubes 3 and e, as shown by the full lines in Figs. 1 to 3. Thelength of the air-column of the instrument is thus changed by thedifference of length of the long and short tubes, this amount beingvariable by means of the tuning-slide 15. Thus the key of the instrumentmay be changed at will almost instantly by the player withoutinterruption of playing.

The coil-springs 8 maintain a constant contact between the plates 1 and11 and 2 and 12, respectively, so that air-tight joints are made betweensaid plates and any wear thereof at once compensated.

lt will be obvious that the device being of small size and neat designmay be placed on an instrument without being unsightly and being ofsimple construction is comparatively inexpensive to make.

Now, having described my invention, what l claim, andv desire to secureby Letters Patent, ist i 1. In a key changing attachment for windinstruments, parallel plane-surfaced plates, tubes carried by each ofsaid plates, one of said. tubes being adapted for connection with amouthpiece and the oher being adapted for connection with the main tubeof a wind instrument, a body movably held between said parallel plates,said body having parallel plane surfaces fitting against the saidplates, there being passages of different lengths through said movablebody between the parallel surfaces thereof, and means for bringing theoutlets of either of said passages into alinement with the tubes carriedby the parallel plates.

2. In a key-changing attachment for cornets, substantially parallelplates, means for yieldably pressing said plates toward each other, oneof said plates having means for connecting the same with a mouthpieceand the other plate having means for connectingl IOS IIO

the saine with the lnain tube of a Cornet, and

a bodT inovably held between said plates7 said body having passages oldifferent lengths through the saine, and said passages being so arrangedthat by movement of the body either of the passages inav be niade 1oYforni a part of the Connecting air-duet between the lparallel plates.

3. A key-Changing attachment for eornets comprising parallel plateshaving tubular eonneetionsI the one adapted 'for connection with themouthpiece of the instrument and the other adapted. for connection withthe main tube thereof]` and a body pivotalhv held` between said plates,there being a direct passage through said body and an indirect passageof Xf'ariable length, said passages being so arranged that by tilting ofthe bodv on its pivots either olf the passages in ay be inade to forni apart of the connection between the parallel plates.

ln testimony whereof l have hereunto sul scribed 'my naine in. thepresence of two witnesses.

M'IC'IAIAEL B. KENDIS. Titnessesz D. O. BARNELL, A. J. Lowin.

